推 mimipudding:我覺得是否定因 另有他因....因為結果已經產生 03/07 17:28
→ mimipudding:所以不會去否定過...這是我的看法^^ 03/07 17:29
109. (30048-!-item-!-188;#058&004735) (GWD 29-Q27 different type)
Though sucking zinc lozenges has been promoted as a treatment for the common
cold, research has revealed no consistent effect. Recently, however, a zinc
gel applied nasally has been shown to greatly reduce the duration of colds.
Since the gel contains zinc in the same form and concentration as the
lozenges, the greater effectiveness of the gel must be due to the fact that
cold viruses tend to concentrate in the nose, not the mouth.
Which of the following, if true, most seriously weakens the argument?
A. Experimental subjects who used the zinc gel not only had colds of shorter
duration but also had less severe symptoms than did those who used a gel
that did not contain zinc.
B. The mechanism by which zinc affects the viruses that cause the common cold
has not been conclusively established.
C. To make them palatable, zinc lozenges generally contain other ingredients,
such as citric acid, that can interfere with the chemical activity of zinc.
D. No zinc-based cold remedy can have any effect unless it is taken or
applied within 48 hours of the initial onset of cold symptoms.
E. Drug-company researchers experimenting with a nasal spray based on zinc
have found that it has much the same effect on colds as the gel does.
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答案是C
這題小弟想問的是到底是否定果 還是否定因阿??
光看題幹還以為是要否定因~"~
可是又看不出來C選項是在否定因還是果
可以請各位指點一下嗎~"~
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